Hi all,

Just found this thread....ahh the memories! I've competed the last three years in a row, and I HIGHLY recommend that you go!

For construction hints, feel free to peruse: http://www.geocities.com/sunbirdz/Aerodesign_Home.html

or

http://www.geocities.com/sunbirdz/20...sign_Home.html

First off, I'd suggest the APC 14x4W as a prop. It seemed to develop the best thrust for our team on the OS engine.

Second, 30 mph is a better takeoff velocity estimate: http://www.angelfire.com/indie/aerostuff/sae2000n8.htm
I used that in our calculations.

Third, don't use the 1223 below Re=200K. Dr. Selig advised that it's prone to developing histeresis (sp?) at about that spec.

Fourth...pray! We were climbing out (easily) carrying 20 lbs last year when our engine quit. It had about 50 flawless flights on that engine, but chose that time to quit. Stupid nitro engines...I fly electric and sailplanes exclusively now

Trust me, at 70 oz/sq.ft, they don't glide very well! :stupid:

Good luck!
Adam